late payment fee

 I received a letter from my teacher in china, it was about the late payment fee. I was wondering if I had any bill that I did not pay for when I received the late fee letter. I went to the cash office, talked to the person. The result was that my check was returned by the bank, It meant that my check did not go through. So the school could not get the money from my bank account. I was so angry about that, because I had not received any emails about the returned check before I received the late payment fee.